The traditional popular music genre of Indonesia, Dangdut, and its classical version is partly derived from Hindustani classical music, especially in the basis of instrumentation, melody, harmony, and beat. Its main instruments are Tabla and sometimes Sitar and modern guitars.

It is traditional for performers who have reached a distinguished level of achievement to be awarded titles of respect; Hindus are usually referred to as pandit and Muslims as ustad. An aspect of Hindustani music going back to Sufi times is the tradition of religious neutrality: Muslim ustads may sing compositions in praise of Hindu deities, and vice versa.

Around the 12th century, Hindustani classical music diverged from what eventually came to be identified as Carnatic classical music. The central notion in both these systems is that of a melodic mode or raga, sung to a rhythmic cycle or tala. These principles were refined in the musical treatises Natya Shastra, by Bharata (2nd–3rd century CE), and Dattilam (probably 3rd–4th century CE).[1]

In medieval times, the melodic systems were fused with ideas from Persian music, particularly through the influence of Sufi composers like Amir Khusro, and later in the Mughal courts. Noted composers such as Tansen flourished, along with religious groups like the Vaishnavites. After the 16th century, the singing styles diversified into different gharanas patronized in different princely courts. Around 1900, Vishnu Narayan Bhatkhande consolidated the musical structures of Hindustani classical music, called ragas, into a number of thaats. Indian classical music has seven basic notes with five interspersed half-notes, resulting in a 12-note scale. Unlike the 12-note scale in Western music, the base frequency of the scale is not fixed, and intertonal gaps (temperament) may also vary; however, with the gradual replacement of the sarangi by the harmonium, an equal tempered scale is increasingly used. The performance is set to a melodic pattern called a raga characterized in part by specific ascent (aroha) and descent (avaroha) sequences, which may not be identical. Other characteristics include "king" (vadi) and "queen" (samavadi) notes and characteristic phrases (pakad). In addition each raga has its natural register (ambit) and portamento (meend) rules. Performances are usually marked by considerable improvisation within these norms.

Music is dealt with extensively in the Valmiki Ramayana. Narada is an accomplished musician, as is Ravana; Saraswati with her veena is the goddess of music. Gandharvas are presented as spirits who are musical masters, and the gandharva style looks to music primarily for pleasure, accompanied by the soma rasa. In the Vishnudharmottara Purana, the Naga king Ashvatara asks to know the svaras from Saraswati.

The most important text on music in the ancient canon is Bharata's Natya Shastra, composed around the 3rd century CE. The Natya Shastra deals with the different modes of music, dance, and drama, and also the emotional responses (rasa) they are expected to evoke. The scale is described in terms of 22 micro-tones, which can be combined in clusters of four, three, or two to form an octave.

While the term raga is articulated in the Natya Shastra (where its meaning is more literal, meaning "colour" or "mood"), it finds a clearer expression in what is called jati in the Dattilam, a text composed shortly after or around the same time as Natya Shastra. The Dattilam is focused on gandharva music and discusses scales (swara), defining a tonal framework called grama in terms of 22 micro-tonal intervals (sruti[2]) comprising one octave. It also discusses various arrangements of the notes (murchhana), the permutations and combinations of note-sequences (tanas), and alankara or elaboration. Dattilam categorizes melodic structure into 18 groups called jati, which are the fundamental melodic structures similar to the raga. The names of the jatis reflect regional origins, for example andhri and oudichya.

Music also finds mention in a number of texts from the Gupta period; Kalidasa mentions several kinds of veena (Parivadini, Vipanchi), as well as percussion instruments (mridang), the flute (vamshi) and conch (shankha). Music also finds mention in Buddhist and Jain texts from the earliest periods of the Christian era.

Narada's Sangita Makarandha treatise, from about 1100 CE, is the earliest text where rules similar to those of current Hindustani classical music can be found. Narada actually names and classifies the system in its earlier form before the Persian influences introduced changes in the system. Jayadeva's Gita Govinda from the 12th century was perhaps the earliest musical composition sung in the classical tradition called Ashtapadi music.

In the 13th century, Sharngadeva composed the Sangita Ratnakara, which has names such as the turushka todi ("Turkish todi"), revealing an influx of ideas from Islamic culture. This text is the last to be mentioned by both the Carnatic and the Hindustani traditions and is often thought to date the divergence between the two.

The advent of Islamic rule under the Delhi Sultanate and later the Mughal Empire over northern India caused considerable cultural interchange. Increasingly, musicians received patronage in the courts of the new rulers, who in their turn, started taking increasing interest in local music forms. While the initial generations may have been rooted in cultural traditions outside India, they gradually adopted many aspects from their kingdoms which retained the traditional Hindu culture. This helped spur the fusion of Hindu and Muslim ideas to bring forth new forms of musical synthesis like qawwali and khyal.

Amir Khusrau is sometimes credited with the origins of the khyal form, but the record of his compositions do not appear to support this. The compositions by the court musician Sadarang in the court of Muhammad Shah bear a closer affinity to the modern khyal. They suggest that while khyal already existed in some form, Sadarang may have been the father of modern khyal.

Much of the musical forms innovated by these pioneers merged with the Hindu tradition, composed in the popular language of the people (as opposed to Sanskrit) in the work of composers like Kabir or Nanak. This can be seen as part of a larger Bhakti tradition, (strongly related to the Vaishnavite movement) which remained influential across several centuries; notable figures include Jayadeva (11th century), Vidyapati (fl. 1375 CE), Chandidas (14th–15th century), and Meerabai (1555–1603 CE).

As the Mughal Empire came into closer contact with Hindus, especially under Jalal ud-Din Akbar, music and dance also flourished. In particular, the musician Tansen introduced a number of innovations, including ragas and particular compositions. Legend has it that upon his rendition of a night-time raga in the morning, the entire city fell under a hush and clouds gathered in the sky, and that he could light fires by singing the raga "Deepak", which is supposed to be composed of notes in high octaves.

At the royal house of Gwalior, Raja Mansingh Tomar (1486–1516 CE) also participated in the shift from Sanskrit to the local idiom (Hindi) as the language for classical songs. He himself penned several volumes of compositions on religious and secular themes, and was also responsible for the major compilation, the Mankutuhal ("Book of Curiosity"), which outlined the major forms of music prevalent at the time. In particular, the musical form known as dhrupad saw considerable development in his court and remained a strong point of the Gwalior gharana for many centuries.

After the dissolution of the Mughal empire, the patronage of music continued in smaller princely kingdoms like Awadh, Patiala, and Banaras, giving rise to the diversity of styles that is today known as gharanas. Many musician families obtained large grants of land which made them self-sufficient, at least for a few generations (e.g. the Sham Chaurasia gharana). Meanwhile, the Bhakti and Sufi traditions continued to develop and interact with the different gharanas and groups.

Until the late 19th century, Hindustani classical music was imparted on a one-on-one basis through the guru-shishya ("mentor-protégé") tradition. This system had many benefits, but also several drawbacks; in many cases, the shishya had to spend most of his time serving his guru with a hope that the guru might teach him a "cheez" (piece or nuance) or two. In addition, the system forced the music to be limited to a small subsection of the Indian community. To a large extent it was limited to the palaces and dance halls. It was shunned by the intellectuals, avoided by the educated middle class, and in general looked down upon as a frivolous practice.[3]

Then a fortunate turn of events started the renaissance of Hindustani classical music.

First, as the power of the maharajahs and nawabs declined in early 20th century, so did their patronage. With the expulsion of Wajid Ali Shah to Calcutta after 1857, the Lucknavi musical tradition came to influence the music of renaissance in Bengal, giving rise to the tradition of Ragpradhan gan around the turn of the century. Raja Chakradhar Singh of Raigarh was the last of the modern era Maharahas to patronize Hindustani classical musicians, singers and dancers.[4][5]

Also, at the turn of the century, two great stars emerged on the horizon: Vishnu Digambar Paluskar and Vishnu Narayan Bhatkhande. Independent of each other, they spread Hindustani classical music to the masses in general, and the Marathi middle class in particular. These two gentlemen brought classical music to the masses by organizing music conferences, starting schools, teaching music in class-rooms, and devising a standardized grading and testing system, and by standardizing the notation system.[6]

Vishnu Digambar Paluskar emerged as a talented musician and organizer despite having been blinded at age 12. His books on music, as well as the Gandharva Mahavidyalaya music school that he opened in Lahore in 1901, helped foster a movement away from the closed gharana system.

Paluskar's contemporary (and occasional rival) Vishnu Narayan Bhatkhande recognized the many rifts that had appeared in the structure of Indian classical music. He undertook extensive research visits to a large number of gharanas, Hindustani as well as Carnatic, collecting and comparing compositions. Between 1909 and 1932, he produced the monumental four-volume work Hindustani Sangeetha Padhathi,[7] which suggested a transcription for Indian music, and described the many traditions in this notation. Finally, it consolidated the many musical forms of Hindustani classical music into a number of thaats (modes), subsequent to the Melakarta system that reorganized Carnatic tradition in the 17th century. The ragas as they exist today were consolidated in this landmark work, although there are some inconsistencies and ambiguities in Bhatkande's system.

In modern times, the government-run All India Radio, Bangladesh Betar and Radio Pakistan helped to bring the artists to public attention, countering the loss of the patronage system. The first star was Gauhar Jan, whose career was born out of Fred Gaisberg's first recordings of Indian music in 1902. With the advance of films and other public media, musicians started to make their living through public performances. As India was exposed to Western music, some Western melodies started merging with classical forms, especially in popular music. A number of Gurukuls, such as that of Alauddin Khan at Maihar, flourished. In more modern times, corporate support has also been forthcoming, as at the ITC Sangeet Research Academy. Meanwhile, Hindustani classical music has become popular across the world through the influence of artists such as Ravi Shankar and Ali Akbar Khan.

The rhythmic organization is based on rhythmic patterns called tala. The melodic foundations are called ragas. One possible classification of ragas is into "melodic modes" or "parent scales", known as thaats, under which most ragas can be classified based on the notes they use.

Thaats may consist of up to seven scale degrees, or swara. Hindustani musicians name these pitches using a system called Sargam, the equivalent of the Western movable do solfege:

Sa (Shadja) = Do

Re (Rishabh) = Re

Ga (Gandhar) = Mi

Ma (Madhyam) = Fa

Pa (Pancham) = So

Dha (Dhaivat) = La

Ni (Nishad) = Si

Sa (Shadja) = Do

Both systems repeat at the octave. The difference between sargam and solfege is that re, ga, ma, dha, and ni can refer to either "Natural" (shuddha) or altered "Flat" (komal) or "Sharp" (tivra) versions of their respective scale degrees. As with movable do solfege, the notes are heard relative to an arbitrary tonic that varies from performance to performance, rather than to fixed frequencies, as on a xylophone. The fine intonational differences between different instances of the same swara are called srutis. The three primary registers of Indian classical music are mandra (lower), madhya (middle) and taar (upper). Since the octave location is not fixed, it is also possible to use provenances in mid-register (such as mandra-madhya or madhya-taar) for certain ragas. A typical rendition of Hindustani raga involves two stages:

Alap: a rhythmically free improvisation on the rules for the raga in order to give life to the raga and flesh out its characteristics. The alap is followed by a long slow-tempo improvisation in vocal music, or by the jod and jhala in instrumental music.

Bandish or Gat: a fixed, melodic composition set in a specific raga, performed with rhythmic accompaniment by a tabla or pakhavaj. There are different ways of systematizing the parts of a composition. For example:

Sthaayi: The initial, rondo phrase or line of a fixed, melodic composition.

Antara: The first body phrase or line of a fixed, melodic composition.

Aabhog: The fourth and concluding body phrase or line of a fixed, melodic composition, seen more typically in Dhrupad bandishes.

There are three variations of bandish, regarding tempo:

Vilambit bandish: A slow and steady melodic composition, usually in largo to adagio speeds.

Madhyalaya bandish: A medium tempo melodic competition, usually set in andante to allegretto speeds.

Drut bandish: A fast tempo melodic composition, usually set to allegretto speed or faster.

Hindustani classical music is primarily vocal-centric, insofar as the musical forms were designed primarily for vocal performance, and many instruments were designed and evaluated as to how well they emulate the human voice.

Dhrupad is an old style of singing, traditionally performed by male singers. It is performed with a tambura and a pakhawaj as instrumental accompaniments. The lyrics, some of which were written in Sanskrit centuries ago, are presently often sung in brajbhasha, a medieval form of North and East Indian languages that was spoken in Eastern India. The rudra veena, an ancient string instrument, is used in instrumental music in dhrupad.

Dhrupad music is primarily devotional in theme and content. It contains recitals in praise of particular deities. Dhrupad compositions begin with a relatively long and acyclic alap, where the syllables of the following mantra is recited:

The alap gradually unfolds into more rhythmic jod and jhala sections. These sections are followed by a rendition of bandish, with the pakhawaj as an accompaniment. The great Indian musician Tansen sang in the dhrupad style. A lighter form of dhrupad, called dhamar, is sung primarily during the festival of Holi.

Dhrupad was the main form of northern Indian classical music until two centuries ago, when it gave way to the somewhat less austere khyal, a more free-form style of singing. Since losing its main patrons among the royalty in Indian princely states, dhrupad risked becoming extinct in the first half of the twentieth century. However, the efforts by a few proponents, especially from the Dagar family, have led to its revival and eventual popularization in India and in the West.

Some of the best known vocalists who sing in the Dhrupad style are the members of the Dagar lineage, including the senior Dagar brothers, Nasir Moinuddin and Nasir Aminuddin Dagar; the junior Dagar brothers, Nasir Zahiruddin and Nasir Faiyazuddin Dagar; and Wasifuddin, Fariduddin, and Sayeeduddin Dagar. Other leading exponents include the Gundecha Brothers, who have received training from some of the Dagars. Leading vocalists outside the Dagar lineage include the Mallik family of Darbhanga tradition of musicians; some of the leading exponents of this tradition were Ram Chatur Mallick, Siyaram Tiwari, and Vidur Mallick. At present Prem Kumar Mallick, Prashant and Nishant Mallick are the Dhrupad vocalists of this tradition.

Khyal is a more modern Hindustani form of vocal music. Khyal, literally meaning "thought" or "imagination" in Hindustani and derived from the Arabic term., is unusual as it is based on improvising and expressing emotion. A Khyal is a two- to eight-line lyric set to a melody. The lyric is of an emotional account possibly from poetic observation.[clarification needed] Khyal contains a greater variety of embellishments and ornamentations compared to dhrupad. Khyal's romanticism has led to it becoming the most popular genre of Hindustani classical music.

The importance of the Khyal's content is for the singer to depict, through music in the set raga, the emotional significance of the Khyal. The singer improvises and finds inspiration within the raga to depict the Khyal.

The origination of Khyal is controversial, although it is accepted that this style was based on Dhrupad and influenced by outside Musical influences. Many argue that Amir Khusrau created the style in the late 14th century. This form was popularized by Mughal Emperor Mohammad Shah, through his court musicians. Some well-known composers of this period were Sadarang, Adarang, and Manrang.

Another vocal form, taranas are medium- to fast-paced songs that are used to convey a mood of elation and are usually performed towards the end of a concert. They consist of a few lines of poetry with soft syllables or bols set to a tune. The singer uses these few lines as a basis for fast improvisation. The tillana of Carnatic music is based on the tarana, although the former is primarily associated with dance.

Tappa is a form of Indian semi-classical vocal music whose specialty is its rolling pace based on fast, subtle, knotty construction. It originated from the folk songs of the camel riders of Punjab and was developed as a form of classical music by Mian Ghulam Nabi Shori or Shori Mian, a court singer for Asaf-Ud-Dowlah, the Nawab of Awadh. "Nidhubabur Tappa", or tappas sung by Nidhu Babu were very popular in 18th and 19th-century Bengal. Among the living performers of this style are Laxmanrao Pandit, Shanno Khurana, Manvalkar, Girija Devi, Ishwarchandra Karkare, Jayant Khot and Meeta Pandit.

Thumri is a semi-classical vocal form said to have begun in Uttar Pradesh with the court of NawabWajid Ali Shah, (r. 1847–1856). There are three types of thumri: poorab ang, Lucknavi and Punjabi thumri. The lyrics are typically in a proto-Hindi language called Brij Bhasha and are usually romantic.

In the Indian sub-continent, Ghazal became the most common form of poetry in the Urdu language and was popularized by classical poets like Mir Taqi Mir, Ghalib, Daagh, Zauq and Sauda amongst the North Indian literary elite. Vocal music set to this mode of poetry is popular with multiple variations across Central Asia, the Middle East, as well as other countries and regions of the world. Ghazal exists in multiple variations, including semi-classical, folk and pop forms.

Although Hindustani music clearly is focused on the vocal performance, instrumental forms have existed since ancient times. In fact, in recent decades, especially outside South Asia, instrumental Hindustani music is more popular than vocal music, partly due to a somewhat different style and faster tempo, and partly because of a language barrier for the lyrics in vocal music.

A number of musical instruments are associated with Hindustani classical music. The veena, a string instrument, was traditionally regarded as the most important, but few play it today and it has largely been superseded by its cousins the sitar and the sarod, both of which owe their origin to Persian influences. Other plucked or struck string instruments include the surbahar, sursringar, santoor, and various versions of the slide guitar. Among bowed instruments, the sarangi, esraj and violin are popular. The bansuri, shehnai and harmonium are important wind instruments. In the percussion ensemble, the tabla and the pakhavaj are the most popular. Various other instruments have also been used in varying degrees.